Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3642a9c66b8186e…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 22:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f9a68af808bcd48ca4bcd0b76df01d4 SHA-1: 365d198ba32e4b0942eb6f81a1ad4fcd304ccd6f SHA-256: c3642a9c66b8186e8c18d95664a7db9d8727b701e25411be6156b7774083d969
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites. This suggests the document is designed to host a link farm, likely for phishing or to redirect users to malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://brandweeramsterdamamstellanden.nl/userfiles/file/poletuxiwufajazexis.pdf
    • https://aquafilling.com/userfiles/file/13209853056.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d2211dbf31d277bee7200d3ce17ec1d6/12471234265.pdf
    • http://sincaremedicaltour.com/js/upload/lajasidanawilap.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4267bf25---visizijekegedubulas.pdf
    • https://stratasphere.online/userfiles/file/23873860244.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bfa8b405---letugelabalepafunagaxi.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9usedhf8ri3fejmg16m33pkbtj/nexine.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fee4b94a---raxomowododiradovarowo.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6dd8e9bb2---23404976242.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c6a0c39383a14d8d52dd790d968cd8bc/40480628075.pdf
    • https://infypos.com/infyposcms/media/ziwodavezibexalu.pdf
    • https://eventaipei.com/upload/files/69641585722.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/japoxujoduwa.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/bafdf17f937d957bf42d6a08203bd816/wiwuzivebeg.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/466388961fda881d66a7cd9cb6e48279/zorajenidejakevedamanow.pdf
    • https://tkquiz.com/userfiles/file/wosadekarenaxo.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lt2v3p00n04lcruvg4c40m79t0/55222038226.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871fd67b65c---dorekodok.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/feliwabewu.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ookml6jm8oilh69c2s0c7gaek/fiveli.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lba60cpn2saoujsnitjl07lg3u/82161789463.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfb79901---jexelevebo.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb6fa6d6a---bufid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=increase+height+with+acupressure
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8a16e6f1a486a96e0fede023103877f9/rezawatadozon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
font_01_sfnt_off000107f6.bin
2a5e86b67d160fc60128b8e4999b55b8802ce9ea5b1d61cf67184ee43de95754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 17636 bytes
font_02_sfnt_off00013593.bin
4564ec74603024d471277e03a317f09d6c52d8f826cfa6481035f399694fc49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 10624 bytes

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